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Hyde Park violence: Police officer stabbed after 'water fight' turns hostile Hyde Park violence: Three stabbed including police officer after 'water fight' turns hostile
(35 minutes later)
A police officer suffered a head injury when a large crowd became hostile after gathering for a spontaneous water fight. Three people including a police officer have been stabbed after a spontaneous “water fight” in London’s Hyde Park became violent.
Bottles were among a range of items thrown at officers who were policing the event by the Serpentine in London's Hyde Park, Scotland Yard said. Bottles and other items were thrown at police officers in attendence near the Serpentine as parts of an “increasingly large crowd became hostile” at around 8:40pm. 
The increasingly large crowd became hostile at around 8.40pm. One police officer was stabbed and another was injured by a bottle, the Met said. Both have been taken to hospital for treatment and their injuries have been described as not life threatening.
A police spokesman said that one male police officer suffered a head injury and was taken to a central London hospital for treatment. Scotland Yard are awaiting an update on his condition. Police say they are aware of two other people suffering from stab wounds. Both have been taken to hospital. Their conditions are not yet known.  
No arrests have been made and police have appealed for witnesses to come forward. The violence erupted on the hottest day of the year so far as temperatures reached more than 32C in London. 
More follows...  Videos posted on social media show large groups of young people in the area. In one video, posted by YT_Bricks, shouts of, "They're throwing bottles at Fed cars" can be heard. Another Tweet from Vinnie O'Dowd describes a "riot" in the park.
It is suggested in another post that some of the trouble began after officers told part of the crowd to turn off their music. 
Police had been stationed at the Serpentine from 3pm on Tuesday. No arrests have yet been made. 
The National Police Air Service say they are continuing flights into the night following the outbreak of violence. 
Officers remain on the scene and are appealing for anyone with information regarding the incident to call police in Westminster via 101.